
$navHeight: 57px;

#nav-bar-wrap{
  position: fixed;
  top: 0;
  left: 0;
  padding: 0 30px;
  width: 100%;
  height: $navHeight;
  line-height: $navHeight;
  border-bottom: 1px solid #ddd;
  z-index: 999;
  &.default{
    background-color: rgba(0,0,0,0);
    transition: all 0.5s;
    .black {
      display: none;
    }
  }
  &.background {
    background-color: #fff;
    transition: all 0.5s;
    .white {
      display: none;
    }
  }
  .logo {
    height: 50%;
  }
 /*小屏幕*/
 @media screen and (max-width: 768px){
  
 }
 /*md*/
 @media screen and (max-width: 1280px){
  
 }
}


 